▼ Menu

12SQ7GT/G

 
See also:
The 'Magic Three' Valves
    
Extras ▼

 

The 12SQ7GT/G is a double diode triode with heaters designed to operate from the 12.6 volts available in a vehicle. The diodes are for AM signal detection and AGC detection whilst the triode section is for first audio amplification. This is typical for a valve used in a radio superhet receiver.
Apart from the 12.6 volt heaters the valve characteristics are equal to the 6SQ7 the GT is for glass tubular construction.
The wide glass tube envelope is 28 mm in diameter and, excluding the IO base pins, is 60 mm tall.
References: Datasheet, 1040 & 1043. Type 12SQ7GT/G was first introduced in 1939.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
m
g1
k
a(d2)
a(d1)
a
h
h

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
12.6
0.15
250
-2.0
0.9
91,000
1.1
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 21, 2013.
Return to Main Index